A hallucinogenic plant custom-designed in the world of The Sundered and supposedly designed for stress-relief, unfortunately addictive.
It is grown exclusively by the Soothsayers.
Of course, as Aakesh tries to tell Harry, anything that relieves stress in a human can become addictive; it isn’t a simple matter of physiology, but of how the human soul works. Addiction is a much bigger problem than mere chemistry could ever address.